The researchers found that the rodents' preferences varied slightly between strains, as well as between sexes (with females partial to higher temperatures, possibly because of their thinner protective layer of fat), confirming that there is no single set of conditions in which all mice feel cosy.

ECONOMIST: ��and they may return the favour

"NABE's January 2009 Industry Survey depicts the worst business conditions since the survey began in 1982, confirming that the U.S. recession deepened in the fourth quarter of 2008, " Sara Johnson, a NABE economist, told CNNMoney.com.

CNN: Tens of thousands lose jobs as recession bites